This 2cm wide heavy-duty woven strap with a round ring can secure the molded cup securely to almost any chair leg. It is adjustable from 40cm to 70cm, accommodating most players. This strap will protect your floor from scratches and keep your cello stable during practice or performance. Made from high-quality materials for durability and long-lasting use. Folds compactly for easy storage and helps prevent the cello from slipping or damaging the floor. Size: 30 * 5 * 0.5cm / 12 * 2 * 0.2 inch (L*W*H). Color: black. Material: Plastic + nylon. Package Contents: 1 Cello Anti-slip Device. Only the above package content is included; other products are not included. Note: Lighting and different displays may cause the item's color in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3cm.